Rotary pump



May 4 1926. 1,582,922

J.. FREUD ROTARY PUMP 2 Sheets-Sheet 2 Filed Au S. 8 1921 zvefza?"Patented May 4, 1926.

PATENT OFFICE.

JOSEPH FREUD, OF CHICAGO, ILLINOIS.

ROTARY PUMP.

Appunti@ med August a, 1921. serial 1ro. 490,550.

To all whom t magno/noem.'

Be it known that I, JOSEPH FREUD, a citizen of the United States, and aresident of Chicago, in the county of Cook and State a of Illinols, haveinvented certain new and useful Improvements in Rotary Pumps, of

v which the following is a full, clear, and exact description. A

The invention relates to rotary pumps. One object of the invention is toprovide an improved rotary 1pump in which the vanes are composed of rewith provision for lateral deection to cause the sldes of the vane tofrictionally engage the sides of the cylinder and prevent leakage of thefluid between the rotor and the ends of the cylinder. Another object ofthe invention is to provide, a structure in which a plurality of pumpsare driven in a case containing lubrlcant. Other objects of theinvention will appear from the description. The inventionconsists in theseveral novel features hereinafter set forth and more particularlydescribed in claims at the conclusion hereof. i

In the drawings: Fig. 1 .is a transverse section of a rotary pumpembodying the invention. Fig. 2 is a longitudinal section.

Fig. 2 isa longitudinal section, slightly rep duced, showing the portionon the inlet which communicates with the cylinder, the rotor and vanesbeing omitted. Fig. 3 is a section showing a plurality of pumps mountedin a case adapted to contain ubricant. Fig. 4 is a detail perspective ofone of the vanes, the sections being separated for illustrativepurposes.

lThe pump casing comprises a cylinder 5 provided with lugs 6 whereby1 itmay be secured in a case 43, a head 8 which is provided with a bearing 9for a drive shaft 10 and a head 11, said heads being secured to thecylinder by screws 12. An inlet pipe 13 for admitting fluid is connectedto the top of the cylinder and an exhaust pipe 14 for the escape offluid under pressure from the cylinder is also connected to the top ofthe cylinder. The lower end of the inlet pipe 13 is in communicationwith a groove 15 which extends from 'the pipe circumferentially aroundthe cylinder in gradually deatively movable sections creasing depth andwhich is provided with oblique branches 16 and 17, the branchestermlnating at 15a in the cylinder Where the admission ofl fluid underpressure is to be cut ofl from-the spaces between-the vanes. An' outletgroove 18 extends circumferential- 1y around the cylinder and comprisesoblique branches 19 and 20 which commence at that point in the cylinderat which the exhaust of fluid under pressure is to begin and is ofgradually increasing de th from that point to the exhaust pipe 14.characteristic of these ports is thatthey extend substantially from endto end of the cylinder so that the wear on the outer ends of the vaneswhich rotate in the cylinder is equalized rather than localized.

A shaft 10 is eccentrically mounted in the cylinder and a rotor driventhereby comprises a body formed of sections 22 and 23 which are securedto rotate together by pins 24 which are secured in the sections 23 andare fitted into sockets 25' in the section 22. Springs 26 act on thepins 24 to press the sections apart to cause the sides of the rotor tofit against the inner faces of the heads 11 and 8 respectively. A ring27 is held in annular grooves in sections 22 and 23 to revent fluid frompassing from one side of the rotor to the other through the spacebetween the sections. Section 22 is secured to shaft 10 by a key 28.

Longitudinal guide-grooves 29 are formed in the rotor and extend fromend to end thereof and a vane 30 is slidably held in each groove, sothat it will, in its rotation. retain contact between its periphery orouter end and the wall of the cylinder in which the'rotor iseccentrically mounted. Each vane 30 comprises a member 31 which isprovided with channels 32 and 33 having oppositely inclined innersurfaces 34 and 35 and sections 36 and 37 fitting in the channelsrespectively and having correspondingly inclined inner surfaces 38 and39. The coactin inclined surfaces between they sections o the vanes areformed so that centrifugal force will deflect the sections 36 and 37outwardly so that their outer ed es 40 and 41 will contact with thecylin er heads 11 and 8 respectively to close the space pumps and isdriven bv ay suitable gear 45- on a shaft 46 which extends through oneside of the case 43 and may be driven by an electric motor outside ofthe case. The inlet and exhaust pipes 13 and 14 extend through the top47 of the casing 43.1 By mounting the pumps in this manner, thelubricant will seal all openings in the pumps, and the gearing-fordriving the shaft will run in lubricant and sufficient oil will workinto the pumps to lubricate the part-s without special lubricatingmeans. l The end of the outlet 18 is disposed substantially at the rearedge of the vanes when the centers of the vanes are.V coincident withthe line' of contact between the rotor body^ and the cylinder and theinlet 15 is spaced .from the end of the outlet a sufficient distance toavoid escape of air under pressure between' the rotor and the cylinderfrom the outlet to the inlet and, by this construction, back pressure inthe inlet is avoided.

In operation,the shaft 10 will be driven to continuously operate therotors of both pumps. As the vanes in successive rotation reach theintake port 13, air will pass into the space in front of the vanes and:as they pass the inner end 15a of the intake-grooves 15, the'air infront of the vanes will' be forced through the exhaust groove 19 andpipe 14 for work wherever desired. A series of seven vanes isillustrated and the ends of the intake and exhaust ports are correlatedso that the spaces in front of the vanes will be Asuccessively cut oiffrom the intake betfore the vane ahead of it clears the commencement ofthe exhaust port. During this operation, centrifugal force will causethe vane-sections 36 and 37 to be directed outwardly and the coactinginclined surfaces between the vane-sections will deflect the sections 36and 37 Aendwise of the cylinder and prevent leakage of the fiuid betweenthe vanes and the cylinder ends. When the construction shown in Fig. 3is used, the pumps will be submerged in oil and be self-lubricating. v

The inveniton exemplifies a rotary pump in which the vanes are formed ofsections to prevent leakage between their ends and the cylinder-headsand a' characteristic of this construction is that the pressure of theend-sections varies according to the centrifugal force which isdependent upon thel speed of the motor. Another characteristic of theinvention is that a plurality of pumps are mounted so that no speciallubricators are necessary to lubricate the parts inside of the pumpcasing.

and a rotor provided with a radially slidable vane comprising a memberwhich has its outer edge engaging and controlled by the cylinder, and anend member movable to engage a cylinder end, said members being providedwith coacting surfaces between them by which centrifugal force willshift the end menber longitudinally against the cylinder en 2. In arotary pump, the combination of a casing having -a cylinder therein, ashaft, and a rotor provided with a radially slidable vane comprising amember which has its outer edge engaging and controlled by the cylinderand longitudinally movable end members, said members having coactinginclined surfaces between them by which centrifugal force will cause theend members -to be shifted longitudinally against the cylinder ends. i

3. In a rotary pump, the combination of a c 4. In a rotary pump, thecombination of a `casing having a cylinder therein, a shaft, f and arotor provided with a radially slidable vane comprising a -member havingits outer edge formed to engage and controlled by the cylinder andhaving longitudinally extending channels therein, longitudinally movableend members slidably mounted in said channels, and coacting surfacesbetween the members whereby centrifugal force will shift the end membersagainst the cylinder ends respectivel the' channeled member having awall adjacent either face of the end members.

5. In a rotary pump, the combination of a casing having a cylindertherein, a rotor formed of sections .and provided with grooves, vanesslidably mounted in the grooves, means to spread the sections, and aring interfitting with and between the sections.

6. In a rotary pump, the combination of a casing having a cylindertherein, a rotor.

formed of a pair of axially disposed seeformed oaxially disposedsections and protions and provided with grooves, vanes slidvided Withgrooves, vanes slidably mounted -ably mounted in the grooves, means toin the grooves, pins disposed betweenthe 10 spread the sections, andmeans for securing sections for securing the sections against re1- 5 thesections against relative rotation. ative rotation, and springs abuttingagainst 7 In a rotary pump, the combination of the pins to spread thesections. a casing having a cylinder therein, a rotor JOSEPH FREUD.

